*A Muffler is a good start but I really think they need a truly tuned EXPANSION CHAMBER like most 2 stroke motor cycles need. I forgot how WET and messy these little engines were.*
Too bad that muffler is 50 bucks now. Same price as the engine. The 15 dollar muffler is just the metal ring that goes around the ports with a small hole in the side
Even with the muffler - the engine should still be fairly "cool" ... Diesels excel in many areas - too bad it has not wide-spread in the US as it was the case with Europe. Thank you for sharing this video.
As for the last question on your video - wether or not a muffler is needed - I would personally take it off - the noise difference is not much, plus the engine is running a bit more "free" .. my opinion.
At around 7:30" of the video - you mention the dark color of the oil residue - you don't want to run the engine "spitting out" dark oil .. this is an indicator you are running it a bit over-compressed. Back out the compression setting a bit .. the exchaust oil color should be amber .. not dark .. just my input. Also - did you add some cetane booster ( about 2% ) to the fuel ? That should help a lot.
My cox engines are over heated i want to know what percentage of oil ,eather,and kerosen mixture at what air tempreture over here 20deg c is only in dec and jan or i need a large size of head
So you can make it idle by lowering the compression via the Tommy bar? I had a diesel once, but the Tommy Bar was stuck, and I never could get it to run. I had a box full of cox .049's when I was a kid. My dad had one that had the throttle sleeve for an 049 powered car. It would idle so smoothly
I am sure it will work, just make the diameter a tad smaller to ensure a tight fit. You can also insert a brass or alu tube or even a rolled up bear can material into the exhaust opening, just fix with JB weld or similar.
when converted to Diesel is it just diesel you can get at any gas station? or is it a special mixture? also does it make more or less power on this converted fuel system ?
thank you for your interest. It's not exactly "diesel" as in a automobile, it's a model diesel engine and is so called because the ignition method is by compression, loosely similar to a diesel engine. Straightly speaking, model diesel engines should be described as Homogeneous Charge Compression Ignition (HCCI) engines. The model diesel fuel is a mixture of ether, kerosine and castor oil ( a basic one has equal parts of each), sometimes an ignition improver such as amyl nitrate is added to aid ignition. Compared to a model glow engine, a model diesel engine produces more torgue and can swing a gigger propeller at slower speed.
Thanks u sir need this infermation i also have two cox and one norvel .061 engine norvel runs up to 28deg c but cox bee diesel or glow gives me truble at this temp i am from punjab (india) the temp incold weather 20 to 26 deg c
Hi, sorry I simply cannot remember as it was bought over thiry years ago when Cox products were readily available. The model diesel fuel was Model Technics D1000, available in UK.
Hi, this engine was built from parts savaged from two similar engines bought in the early 60s, may be 1962. The diesel head was bought in the 90s, may be 1997. It was a summer day in UK so air temp might be around 20 degree C.
And my all other glow and gas engines run well nov to march end even on30deg c i never use nitromethane it hard to find in iindia only 20percent casteroil and rest is methnol but with cox engines i got problame if i run in now above 40deg c with touching cube of ice on the head of both enginens they run well so prbleame is only of over heating in cox engines i bought cox diesel engine last year run 45 times every flight is for 3to5 minitus suddenly stars cutting and gives me only headace
I am surprised you can start a Cox engine such as 049 on straight fuel (20% castor 80% meth)! Cox engines do like a bit of nitromethane. Overheating most likely a result of lean fuel setting. This is what the shop keeper taught me when I bought my first Cox 049: start the engine, don't disconnet the battery yet, lean out the needle until peak RPM (engine screaming), back off needle 1/4 turn or so (engine note drops a tad), disconnect battery. Other than that I have no idea about your overheating problem, sorry.
No, it has a characteristic sweet smell of ether and burnt castor oil; in other words "heaven" to model diesel engines owners. Most would say the smell reminds them of their childhood.
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*A Muffler is a good start but I really think they need a truly tuned EXPANSION CHAMBER like most 2 stroke motor cycles need. I forgot how WET and messy these little engines were.*
Too bad that muffler is 50 bucks now. Same price as the engine. The 15 dollar muffler is just the metal ring that goes around the ports with a small hole in the side
Even with the muffler - the engine should still be fairly "cool" ... Diesels excel in many areas - too bad it has not wide-spread in the US as it was the case with Europe. Thank you for sharing this video.
SWEEET! hope to see the part IV running in a plane!
As for the last question on your video - wether or not a muffler is needed - I would personally take it off - the noise difference is not much, plus the engine is running a bit more "free" .. my opinion.
At around 7:30" of the video - you mention the dark color of the oil residue - you don't want to run the engine "spitting out" dark oil .. this is an indicator you are running it a bit over-compressed. Back out the compression setting a bit .. the exchaust oil color should be amber .. not dark .. just my input. Also - did you add some cetane booster ( about 2% ) to the fuel ? That should help a lot.
My cox engines are over heated i want to know what percentage of oil ,eather,and kerosen mixture at what air tempreture over here 20deg c is only in dec and jan or i need a large size of head
So you can make it idle by lowering the compression via the Tommy bar? I had a diesel once, but the Tommy Bar was stuck, and I never could get it to run.
I had a box full of cox .049's when I was a kid. My dad had one that had the throttle sleeve for an 049 powered car. It would idle so smoothly
Well I have an old muffler laying around but it's missing the small metal clip and exhaust pipe.
Should a thin aluminium plate work for making it one?
I am sure it will work, just make the diameter a tad smaller to ensure a tight fit. You can also insert a brass or alu tube or even a rolled up bear can material into the exhaust opening, just fix with JB weld or similar.
Boy those mufflers worked great remember lmao
yeah back in the good ole days nobody cared. to bad I was born in 2006. My neighbors probably hate me
when converted to Diesel is it just diesel you can get at any gas station? or is it a special mixture? also does it make more or less power on this converted fuel system ?
thank you for your interest. It's not exactly "diesel" as in a automobile, it's a model diesel engine and is so called because the ignition method is by compression, loosely similar to a diesel engine. Straightly speaking, model diesel engines should be described as Homogeneous Charge Compression Ignition (HCCI) engines. The model diesel fuel is a mixture of ether, kerosine and castor oil ( a basic one has equal parts of each), sometimes an ignition improver such as amyl nitrate is added to aid ignition. Compared to a model glow engine, a model diesel engine produces more torgue and can swing a gigger propeller at slower speed.
In place of Amyl nitrate, you can use Amsoil Diesel Boost.
It's very nice ....
Can you make a video runing a 8x4 prop??? Im still waiting the mailman with my 2 diesel heads!
I think a dieselised Cox 049 is well capable of swinging an 8X4 and it would be nice to see it at ticking-over speed. OK, will try it later.
Hello my friend. Just posted it.
It actually runs on diesel?
Thanks u sir need this infermation i also have two cox and one norvel .061 engine norvel runs up to 28deg c but cox bee diesel or glow gives me truble at this temp i am from punjab (india) the temp incold weather 20 to 26 deg c
Hi, don't quite understand your problems, could you elaborate?
Bro How you bought engine in Punjab
Or Handmade??
Where did you get the muffler and what fuel do you use. Great video
Hi, sorry I simply cannot remember as it was bought over thiry years ago when Cox products were readily available. The model diesel fuel was Model Technics D1000, available in UK.
mylittlediesels cheers mate
Try cox international in Canada for parts they are great to deal with
How old is this engine and what is air temp
Hi, this engine was built from parts savaged from two similar engines bought in the early 60s, may be 1962. The diesel head was bought in the 90s, may be 1997. It was a summer day in UK so air temp might be around 20 degree C.
And my all other glow and gas engines run well nov to march end even on30deg c i never use nitromethane it hard to find in iindia only 20percent casteroil and rest is methnol but with cox engines i got problame if i run in now above 40deg c with touching cube of ice on the head of both enginens they run well so prbleame is only of over heating in cox engines i bought cox diesel engine last year run 45 times every flight is for 3to5 minitus suddenly stars cutting and gives me only headace
I am surprised you can start a Cox engine such as 049 on straight fuel (20% castor 80% meth)! Cox engines do like a bit of nitromethane. Overheating most likely a result of lean fuel setting. This is what the shop keeper taught me when I bought my first Cox 049: start the engine, don't disconnet the battery yet, lean out the needle until peak RPM (engine screaming), back off needle 1/4 turn or so (engine note drops a tad), disconnect battery. Other than that I have no idea about your overheating problem, sorry.
Do these engines smell like a kerosene jet engine while running?
No, it has a characteristic sweet smell of ether and burnt castor oil; in other words "heaven" to model diesel engines owners. Most would say the smell reminds them of their childhood.
It ran better with the muffler
Yes, I think so too.